I have a couple of questions:

First, what is the differences in the 04 and 05 ECM/wiring? The reason I ask is I'll be using an 04 ECM/wiring harness (5.3L) for my 68 pickup.

But, I also just got an 05 Silverado and would like to add a "05 silverado" unlimited liscence to my current HPtuner "subscription" rather than having both on 04 silverado and 05 silverado single liscence.

But isn't it correct, that to reflash the ECM from 04 to 05 you have to have a subscription to both anyways?

I'm not planning on doing much to the Silverado, but the 68 will have significant work done to it, so I will NEED to be able to program it.

Thanks

 

I have full model/year licences for 4 different years and HPT wouldn't let me put a 2002 on a 2001, so you probably won't be able to unless they have changed the software since I tried